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Question 6

1pts

The Zero flag is clear when the result of an arithmetic operation is zero.

false

The Correct Answer and Explanation is :

The statement “The Zero flag is clear when the result of an arithmetic operation is zero” is false.

Explanation:

The Zero Flag (ZF) in a microprocessor or computer system is a status flag used to indicate whether the result of an arithmetic operation is zero or not. It is a bit in the processor’s status register (often in the flags register) and can be set (enabled) or cleared (disabled) depending on the result of the operation.

• When is the Zero Flag set?
  The Zero Flag is set (i.e., it becomes “1”) when the result of an arithmetic operation (such as addition, subtraction, or a logical comparison) is zero. For example, if a processor performs the operation 5 - 5, the result will be zero, and the Zero Flag will be set to 1. This indicates that the result of the operation was zero.
• When is the Zero Flag cleared?
  The Zero Flag is cleared (i.e., it becomes “0”) when the result of the arithmetic operation is non-zero. For example, if the processor performs the operation 5 - 3, the result will be 2, which is non-zero, so the Zero Flag will be cleared.

In the context of the statement, the Zero Flag is set when the result is zero, not cleared. The flag helps the processor to make decisions based on whether an operation results in zero, which is important in conditional branching, loops, and comparisons in programming.

For clarity, here is an example:

• After the operation A = B - B (where B is any non-zero value), the Zero Flag will be set because A = 0.
• After the operation A = B - C (where B and C are not equal), the Zero Flag will be cleared because A will be non-zero.

Therefore, the correct statement should be: “The Zero Flag is set when the result of an arithmetic operation is zero.”